Alongside my open-source products and reference architectures, explore the mission-critical enterprise systems I architected and delivered across banking, government, energy (SCADA), and manufacturing over my 25+ year career.
A self-hosted, multi-user subscription and personal finance tracking platform with zero freemium paywalls. Features real-time multi-currency exchange rates, Bring-Your-Own-Key (BYOK) AI cost-saving recommendations, and automated SMTP renewal alerts.
A high-performance, zero-allocation .NET A/B testing library engineered for microservice architectures. Features a Fluent Builder API, deterministic MurmurHash3 traffic bucketing, distributed Redis state, and Fail-Open resilience.
A distributed background ingestion engine that consumes raw, unstructured customer emails via Redis Streams and orchestrates Microsoft Semantic Kernel & Google Gemini AI to classify, prioritize, and transform them into structured JSON tickets.
An enterprise-grade authentication and authorization reference architecture built on ASP.NET Core (.NET 8). Implements PBKDF2 password hashing, strict Refresh Token Rotation, IP-based Rate Limiting, Clean Architecture, and full unit/integration test coverage.
An end-to-end observability reference implementation for distributed systems and microservices on ASP.NET Core Web API, featuring OpenTelemetry instrumentation, distributed tracing, metrics collection, and Jaeger integration.
A schema-driven GraphQL reference architecture on ASP.NET Core designed to solve over-fetching and under-fetching bottlenecks in complex relational data graphs beyond traditional RESTful endpoints.
22 mission-critical systems delivered for DenizBank, HSBC, fastPay, Central Bank of Türkiye, İZGAZ, and municipalities.
Visit my GitHub profile for additional code samples, architectural prototypes, and open-source contributions.
Real-world commercial and public-sector systems where I led the architecture, backend engineering, or technical delivery. Filter by industry below.
Led the technical management and architectural preparation of DenizBank AG (Austria) Open Banking and FinTech APIs in compliance with the EU PSD2 directive, enabling third-party payment providers (TPPs) to securely execute financial transactions using eIDAS QWAC certificates.
Architected and developed the backend services and high-throughput Message Dispatcher layer for DenizBank’s next-generation Internet Banking platform. Refactored legacy non-RESTful banking flows into modern REST APIs and designed end-to-end transaction pipelines.
Designed and built the .NET Core Web API backend for instant retail loan origination inside the fastPay mobile wallet—covering credit eligibility rule evaluation, dynamic repayment schedule calculation, digital contract approval, and instant loan disbursement.
Developed the digital bancassurance integration enabling DenizBank Internet Banking customers to configure coverage limits, calculate premiums in real time, process payments, and issue active insurance policies online.
Spearheaded the backend analysis, service adaptation, and production rollout for the redesigned HSBC Mobile Banking application, aligning core banking APIs with new mobile user journeys and security standards.
Engineered new financial capabilities, performance optimizations, and mission-critical production enhancements for the backend layer of MobilDeniz, DenizBank’s flagship mobile banking app serving millions of active users.
Architected a centralized procurement and tender management platform for the Central Bank of the Republic of Türkiye—featuring dynamic tender templates, multi-stage internal approval workflows, and automated specification document generation.
Built a GIS-integrated workforce management platform for Istanbul Gas Distribution (İGDAŞ) to dispatch, track, and optimize field maintenance, repair, and metering crews in real time across Istanbul.
Developed a GIS-integrated field automation software enabling Tuzla Municipality teams to manage zoning, infrastructure, and inspection workflows with real-time spatial data.
Engineered a mobile handheld application and synchronization backend for Fatih Municipality inspection teams to conduct on-site queries, issue digital citations, and sync field reports with headquarters.
Designed and delivered a mobile-enabled field control and centralized reporting system to monitor and coordinate municipal field operations across Kocaeli Metropolitan Municipality.
Developed an enterprise asset inventory and preventive maintenance platform for İZGAZ natural gas distribution network, managing field equipment lifecycles, scheduled maintenance, and emergency dispatch.
Built a centralized enterprise maintenance management system (CMMS) for Electricity Generation Company (EÜAŞ) power plants, standardizing equipment maintenance, fault tracking, spare parts inventory, and work orders.
Architected and maintained the core subscriber lifecycle and high-volume billing accrual engine for hundreds of thousands of natural gas consumers at İZGAZ (GDF SUEZ), covering contracts, tariff calculation, invoicing, and collections.
Engineered mission-critical telemetry communication software connecting İZGAZ natural gas distribution stations with BOTAŞ national grid SCADA servers for continuous, real-time gas flow, pressure, and consumption data exchange.
Developed a capital expenditure (CapEx) and grid expansion tracking system to manage contractor progress payments, bill of quantities, and budget variance analysis for natural gas infrastructure projects.
Pioneered an early handheld mobile meter-reading and on-site thermal invoice printing system for natural gas field crews, complete with consumption anomaly detection and central database synchronization.
Designed and built a specialized ERP/MES platform managing the end-to-end lifecycle of industrial tire mold manufacturing—tracking custom orders, shop-floor operator performance, inventory, dispatch notes, and invoicing.
Developed a real-time Manufacturing Execution System (MES) to monitor factory floor work orders, raw material consumption, shift OEE efficiency, and scrap rates.
Built a centralized Quality Document Management System (QDMS) digitizing ISO compliance workflows, document versioning, multi-level approvals, and controlled distribution across departments.
Engineered a metrology and calibration tracking system to schedule periodic accuracy tests, manage certificates, and analyze measurement drift for industrial gas meters and pressure station instruments.
Developed a commercial ERP and accounting software package for SMEs featuring inventory control, accounts receivable/payable, invoicing, and general ledger modules.